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[PATCH] device-mapper ioctl: add skip lock_fs flag

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Add ioctl DM_SKIP_LOCKFS_FLAG for userspace to request that lock_fs is
bypassed when suspending a device.

There's no change to the behaviour of existing code that doesn't know about
the new flag.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alasdair G Kergon 2006-01-06 00:20:07 -08:00 • committed by Linus Torvalds
parent aa8d7c2fbe
commit 6da487dcc0
2 changed files with 17 additions and 5 deletions
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11
include/linux/dm-ioctl.h
View file

@ -272,9 +272,9 @@ typedef char ioctl_struct[308];
#define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 4
#define DM_VERSION_MINOR 5
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2005-01-12)"
#define DM_VERSION_EXTRA "-ioctl (2005-10-04)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
@ -301,8 +301,13 @@ typedef char ioctl_struct[308];
#define DM_BUFFER_FULL_FLAG (1 << 8) /* Out */
/*
* Set this to improve performance when you aren't going to use open_count
* Set this to improve performance when you aren't going to use open_count.
*/
#define DM_SKIP_BDGET_FLAG (1 << 9) /* In */
/*
* Set this to avoid attempting to freeze any filesystem when suspending.
*/
#define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */
#endif /* _LINUX_DM_IOCTL_H */